package com.rocpenghua.codec;

import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESKeySpec;
import java.security.SecureRandom;

/**
 * Describe:
 * Created by AlexP on 2022/4/18.
 */
public final class DESUtil {

    private DESUtil() {
    }
    public static String DES_KEY_VALUE = "qazQAZ!@#123WSX*";
    private final static String DES = "DES";

    public static byte[] encrypt(byte[] src, byte[] key) throws Exception {
        // DES算法要求有一个可信任的随机数源
        SecureRandom sr = new SecureRandom();
        // 从原始密匙数据创建DESKeySpec对象
        DESKeySpec dks = new DESKeySpec(key);
        // 创建一个密匙工厂，然后用它把DESKeySpec转换成一个SecretKey对象
        SecretKeyFactory keyFactory = SecretKeyFactory.getInstance(DES);
        SecretKey securekey = keyFactory.generateSecret(dks);
        // Cipher对象实际完成加密操作
        Cipher cipher = Cipher.getInstance(DES);
        // 用密匙初始化Cipher对象
        cipher.init(Cipher.ENCRYPT_MODE, securekey, sr);
        // 正式执行加密操作
        return cipher.doFinal(src);
    }

    /**
     *
     * @param data 密码
     * @param key 加密字符串
     * @return
     */
    public final static String encrypt(String data, String key) {
        try {
            return byte2String(encrypt(data.getBytes(), key.getBytes()));
        } catch (Exception e) {
        }
        return null;
    }

    public static String byte2String(byte[] b) {
        String hs = "";
        String stmp = "";
        for (int n = 0; n < b.length; n++) {
            stmp = (Integer.toHexString(b[n] & 0XFF));
            if (stmp.length() == 1) {
                hs = hs + "0" + stmp;
            } else {
                hs = hs + stmp;
            }
        }
        return hs.toUpperCase();
    }

    /**
     *
     * @param src 数据源
     * @param key 密钥，长度必须是8的倍数
     * @return
     * @throws Exception
     */
    public static byte[] decrypt(byte[] src, byte[] key) throws Exception {
        // DES算法要求有一个可信任的随机数源
        SecureRandom sr = new SecureRandom();
        // 从原始密匙数据创建一个DESKeySpec对象
        DESKeySpec dks = new DESKeySpec(key);
        // 创建一个密匙工厂，然后用它把DESKeySpec对象转换成一个SecretKey对象
        SecretKeyFactory keyFactory = SecretKeyFactory.getInstance(DES);
        SecretKey securekey = keyFactory.generateSecret(dks);
        // Cipher对象实际完成解密操作
        Cipher cipher = Cipher.getInstance(DES);
        // 用密匙初始化Cipher对象
        cipher.init(Cipher.DECRYPT_MODE, securekey, sr);

        // 正式执行解密操作
        return cipher.doFinal(src);
    }

    public final static String decrypt(String data, String key) {
        try {
            return new String(decrypt(String2byte(data.getBytes()), key.getBytes()));
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }

    public static byte[] String2byte(byte[] b) {
        if ((b.length % 2) != 0){
            throw new IllegalArgumentException("长度不是偶数");
        }
        byte[] b2 = new byte[b.length / 2];
        for (int n = 0; n < b.length; n += 2) {
            String item = new String(b, n, 2);
            b2[n / 2] = (byte) Integer.parseInt(item, 16);
        }
        return b2;
    }
}
